Concrete-mixer.



H. M. GAPRON. CONCRETE MIXER. APPLIOATION FILED DEC. 29, 1909.

1 ,003,088. I Patented Sept. 12,1911.

3 SHEETS-SHEET 1.

H. M. CAPRON.

CONCRETE MIXER. nrmouron FILED 1230.29, 1909.

Patented Sept. 12, 1911.

3 SHEETS-SHEET 2.

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H. M. GAPRON.

CONCRETE MIXER.

APPLIOATION FILED 1130.29, 1909.

1,003,088. Patented Sept. 12,1911.

8 SHEETS-SHEET 3.

coumnui PLANOGRAPH CO..WASN1HOTON, D. r.

HORACE 1VL CAIE'RON, OF WINNETKA, ILLINOIS.

CONCRETE-MIXER.

Specification of Letters Patent.

Application filed December 29, 1909.

Patented Sept. 12, 1911.

Serial No. 525,402.

To all whom it may concern:

Be it known that I, HORACE M. CAPRON, a citizen of the United States,residing at Winnetka, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Concrete-Mixers, ofwhich the following is a specification.

My invention relates to a concrete mixer of the sort in which the mixingchamber is formed by a revoluble drum or barrel, into one end of whichthe constituents of the concrete are fed and from the other end of whichthe mixed concrete is discharged by means of a discharge chute.

One of the principal objects of my invention is to provide an improvedform of drum which shall be simple, strong and durable in itsconstruction.

The invention has for further objects such other new and improvedconstructions, arrangements and devices in concrete mixers as will bedescribed in the following specification and particularly set forth inthe claims appended thereto.

The invention in a preferred embodiment is illustrated in theaccompanying drawings, wherein Figure 1 is an elevation of the dischargeend of the device. Fig. 2 a sectional view taken on line 22 of Fig. 1.Fig. 3 a detail section through one pair of the bearing rollers andassociated parts. Fig. 4 a view in perspective of the discharge chute.Fig. 5 an enlarged sectional view through one of the tracks and adjacentparts. Fig. 6 is a detail view illustrating the means for tilting thescoop.

Like characters of reference indicate like parts in the several figuresof the drawings.

Referring to the drawings, the drum is composed preferably of a centralannular member 10, preferably a casting, and of the end pieces 11 and 12which are preferably made of sheet metal. On the member 10, preferablycast integrally therewith, is a rack 13 with which a driving pinion 14meshes, for the purpose of revolving the drum. Any desired means may beemployed for driving the pinion 14, and as such means, in itself, formsno part of my invention, the same is not shown nor described herein.

The drum is revolubly supported upon the bearing rollers 15. It is usualin apparatus of this sort to provide the drum with circuand durabletracks which will not become bent, displaced or easily worn, I form thetracks, indicated at 16, 16 in the drawings, of rails, preferably, railsof T sect-ion, which are given a circular form, and the flanges of whichare riveted, as shown at 17 or otherwise secured to the central member10 and to the adjacent edge of the end piece 11 or 12, as the case maybe. In order to make a firm joint the annular member 10 is preferablyformed with the flanges 18 of reduced thickness, the flanges of therails 16 abutting against the shoulder formed by this reduction inthickness of said member. The ends of the rails constituting the tracks16 may, of course, be welded or otherwise secured together to make agood joint. Preferably, the end pieces 11 and 12 are formed at the feedopening 19 and discharge opening 20 with the outwardly turned flanges 21to which may be secured the angle pieces 21. This construction preventsthe dripping of the concrete around the sides of the drum, which hasoften resulted in the clogging of the driving mechanism of concretemixers of this general sort and which tends to wear out the parts. Thedrum is supported on four bearing rollers 15 which are preferablyflanged wheels revolubly mounted in pairs on the axles 22 which may besupported in any desired manner, for example, by the brackets 28 whichare bolted to the timbers 24, the latter being secured to the timbers25. It is obvious that any other form of supporting frame or structuremight be used in place of that above described. The axles 22 are shownas secured to the brackets by means of the set screws 25. A spacer 26 isinterposed between the wheels on each axle. The wheels are preventedfrom separating because of the engagement of their flanges with thetracks 16. The arrangement of the wheels and axles is a preferredarrangement but might be considerably modified.

The constituents of the concrete are fed into the drum by means of afeed hopper 27 which extends into the opening 19 and is supported fromthe timbers 24 by brackets with any desired means for mixing the concrete. But I have shown in Fig. 2 a pre-' ferred arrangement of mixingdevices, in accordance with which two sets or series of mixing scoops30, are provided. The scoops 30 are longer than the scoops 30 and thetwo sets of scoops are oppositely inclined a longscoop being arrangedopposite each short scoop, as shown. Arranged below thelower-crdischarge ends of ,each pair.

of scoopsBQ, 30 is .21. preferably horizontally placed bucket 31, thesebuckets in the arangemen s sl wnin gb ing o d.

at the discharge.side of the drum. Preferably, .they are arranged sothat as the drum tents into the discharge chute 32 when the same is inthe dotted line positionshow-n in Fig. 2

In ,concrete mixers provided with disterior of thedrum so as toreceive-the mixed concrete o-r-the m xing ;dev1ces on the inner surface-of the drum, it has been customary. to nialre the discharge chute ofuniform.

width, and, -as the discharge 7 opening through which the chute projectsmust be of a relatively small diameter, it has been found that thedischarge from mixers of this character is often too slow, due to thefact that the chute catches too smalla pro portion of the contents ofthe drum. I, thereforaconstruct my discharge chute 32in the tapered formshown in Fig. 4, that is, with its inner end wider than its dischargev.end, and wider, in fact, than the diameter of the discharge opening20). By thus increasing the size of the chute at the place where theconcrete ;iscollected the discharge I of the concrete is made morerapid. In ;order toget the chute into thedrum I preferably construct thesame ,of two longitudinal sections 33 and 34, these sections beingsecured together, after being put through the discharge opening, bymeans ofthe riveted or bolted straps 35 or otherwise. Preferably, thechute is formed with the side of the same .36 which is opposed to therotation of the drum higher than the-.oppositeside37. The chute hasbolted {thereto the lugs 38, by means of which it is rigidly secured toa shaft 39 mounted in the uprights 40, which shaftis provided with apinion 41 of relatively large diameter, with which is meshed a smallerpinion 42 'on a :short shaft 43 .to which is connected be provided whichengages with a pin 46 :on the handle '44, for holding .the handle 44revolves they successively dump their con charge chutes which projectinto the in-.

when the chute is in its discharging position.

The operation of my mixing machine is as follows: The ingredients of theconcretecement, stone, water, sand, etc.are introduced into the drumthrough the feed hopper 27 and are mixed together by the revolution ofthe drum and by the mixing action of the scoops and buckets. In thearrangement of the latter devices shown in Fig. 2, the mixture at theends of the drum is picked up by the scoops 30, 30" and deposited on thebuckets 31 from whichapart at least drops into the chute provided thelatter be in the dotted line position shown in this figure. The rest ofthe concrete drops Shack into the bottom of the drum and is mixed withthe new ingredients which are being constantly fed into the drum through;the feed hopper 27 It-will be seen that the ,curved form of the ends ofthe drum tends to cause the concrete to enter the scoops 30 .or 30 asthe case may be, and that the {buckets 31, which receive the concretefrom ;the scoop, are arranged directly above the ;end of the dischargechute.

The concrete may, of course, be given an initial mixing before it isbegun to be discharged from the drum, in which case the chute will betilted to the position shown in the full lines of Fig. 2.

The rails l6 afford means for securing to- ,gether the parts of thedrum, act as reinforcements to the drum, and, at the same ;time, providetracks for sustaining the drum onthe roller 17 which are verystrong ,anddurable, so that the drum is sure .to ,run true.

I do not claim broadly a circular track unade of a T section rail, orthe combination of such a track with the drum of a concrete mixer, orother revoluble element, as gtlllS subject matter has been divided outof .the present application and is made the sub- ;ject of my pendingapplication Serial N 0. 609,712 filed February 20, 1911, which is acontinuation of the present application in this regard.

I claim:

1. In apparatus of the character described, the combination with bearingrollers, of a drum comprising a central annujlar member and end members,and circular tracks consisting of rails of T section which revolublysupport the drum on the rollers and to the flanges of which are securedthe abutting edges of the annular member and theend members.

2. In concrete ,mixing apparatus,.the combination with a revoluble drumformed on one side with a feed opening and on the other side with adischarge opening, of a plurality of short concaved scoops arranged onthe interior of-the drum on the discharge side thereof, said scoopsbeing arranged obliquely so that they deliver toward the cenarranged onthe discharge side of the drum ter of the drum, a plurality of concavedunder the discharge ends of said scoops, scoops of greater length on thecharging substantially as described. side of the drum, said lastmentioned scoops HORACE M. OAPRON.

5 being obliquely arranged so that they de- WVitnesses: 7 liver towardthe delivery ends of the first P. H. TRUMAN, mentioned scoops, and aplurality of buckets H. L. PEoK.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

